Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3ba4023e93895f…

MALICIOUS

PDF

71.3 KB Created: 2020-08-11 16:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c14c0971d0cc8378a42ce1a9dc9090 SHA-1: 218853bd3620869133c94d86d38262533ba94039 SHA-256: fb3ba4023e93895f4f959443227e8e9f544cd6fb61a1f2469fad61460124ecfc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many pointing to Shopify domains and a critical redirector URL (https://ttraff.cc/pify?keyword=hindu+calendar+2020+usa+pdf). This indicates a link farm strategy, likely designed to distribute further malicious content or manipulate search results. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=hindu+calendar+2020+usa+pdf
    • http://pexatu.shajaceramics.com/uploads/1/3/1/8/131871740/4631657.pdf
    • http://files.billywolfemusic.com/uploads/1/3/0/8/130874201/9415344.pdf
    • http://files.sheleneanderson.com/uploads/1/3/1/8/131856433/5276619.pdf
    • http://files.bochilbarley-fcr.com/uploads/1/3/1/4/131452949/kupelamos.pdf
    • http://zizij.rubensmachine.com/uploads/1/3/2/3/132303238/fojumude.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/50906487045.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/abta_test_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0318/files/oer_support_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13336488851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/94065337511.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/free_unlimited_hidden_object_games.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/xafababodokuxogevipusi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/99183781330.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/kegonizuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d2f.bin
124281b88b871e8d399ac5cfc1d3df333e27b05a6b042963cd4fe98438a5d412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 5076 bytes
font_01_sfnt_off00007e5f.bin
e0d3b014148ec8c41a58353bf7a83af56984b8a9a6763795935320f22b41d1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5F 3780 bytes
font_02_sfnt_off00008c2d.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2D 3720 bytes
font_03_sfnt_off0000978f.bin
0b28d5e5c9fc09c18ea88f26525ac569a20885d3f5590781f1c8ee3bfaa67a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 3228 bytes
font_04_sfnt_off0000a4d5.bin
083a68b8cd438ed9e1866e1fe99dbdf8a0cf274b3953d6e0f5235d677bfbdf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D5 3240 bytes
font_05_sfnt_off0000b1c4.bin
d104b65c883f8e920388b6893a8d989dbd1c4e4d26d5e01740bd7b740ee2777e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 4668 bytes
font_06_sfnt_off0000c08c.bin
151227d7c3486e2a2f201eef488917eb7737ccd1aa092b0f22cd3fb0c03f4d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC08C 12468 bytes
font_07_sfnt_off0000e735.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 4324 bytes
font_08_sfnt_off0000f535.bin
4a935d25e20589af5e2240fba008cc93a18cd2d379224b3c59a9bc58de3cd90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 6860 bytes

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