Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0ce5b0cbc884fa…

MALICIOUS

PDF

65.2 KB Created: 2020-08-04 01:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b5bad4c8aec5e5a1997c95e01ed7447 SHA-1: 521f65e80acd751eafe4bc4da3324fc0cd180eb3 SHA-256: 0a0ce5b0cbc884fa604fa822f72a0e1102f39b0ca87806d99a6323c7dc858786
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a deceptive title and a prominent link that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The presence of numerous other PDF links suggests a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to deliver a second-stage payload, likely via exploitation of a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=mitosis+and+meiosis+test+pdf+answers
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://files.brandtmarineinc.com/uploads/1/3/1/4/131452778/efd7df18c57b9.pdf
    • http://files.theblossomtree.org/uploads/1/3/0/8/130813489/jofime.pdf
    • http://files.marigoldyogaindia.com/uploads/1/3/1/6/131607053/jivujojadilajus_vonuleleku_bewosuwevenuni_legakigero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/miwagemirupamenufuru.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/98264201698.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/xodunaresebonijisinis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/27364235014.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/census_2020_affairscloud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8185/files/toketotezumezerikud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/jojireravin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/hot_potatoes_wiggles.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/30016874870.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/kizidotepeja.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c8.bin
d50c56cbf2baac5beedbe6a95b41d7cc624948a90ea43ff6ee419d671f58c8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 5040 bytes
font_01_sfnt_off0000c4e3.bin
787a80d419e2eeb9b744068bdb64f54579f9d94bbb0399d46657da97bce693f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 10636 bytes
font_02_sfnt_off0000e91a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 4324 bytes

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