Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5d852cfc9e2199…

MALICIOUS

PDF

49.4 KB Created: 2020-08-05 01:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd459338e8724d59cf04f1edd1da3dfd SHA-1: 385c916dd3d6eca45292030e93796bcee3dcded4 SHA-256: ca5d852cfc9e2199c6d168ca5cfbdc64a9131b891c878ec84dc8dff4af50c4f1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=electrical+apprenticeship+interview+questions+and+answers+pdf'. The document body, though partially corrupted, suggests a lure related to 'electrical apprenticeship interview questions and answers pdf'. The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a link farm designed to improve SEO for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=electrical+apprenticeship+interview+questions+and+answers+pdf
    • http://nujori.laptcycling.com/uploads/1/3/2/6/132681409/2785256.pdf
    • http://files.chopstir.com/uploads/1/3/0/8/130815303/963cb21b.pdf
    • http://files.smcfnh.org/uploads/1/3/0/7/130740173/zadewuf_puvapuvogovob_rafaxumu.pdf
    • http://files.leonardopallenberg.net/uploads/1/3/0/7/130739747/logetevafimotefipuxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/the_light_between_oceans_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/zasad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/baximugogaximilekuwij.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/avengers_movies_in_order.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/lefilazafofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/tituzigujigibobero.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/81885235917.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/86914941126.pdf
    • https://cdn.shopify.com/s/files/1/0437/5494/6721/files/pumizarigusejemunezoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/defokofodirozixonoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/60487128256.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/is_driver_booster_safe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007539.bin
e6364cd2216545b947a43a9e5eb97983b5c75910c44df26737ba5b4654840089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 5360 bytes
font_01_sfnt_off0000876d.bin
533d1d64b6ce884020cccd65c68d89954c08a94dffa0636609f65582d3bb4e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 10120 bytes
font_02_sfnt_off0000aa09.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA09 4324 bytes

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