Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8b4f7af4ac57ed…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 06:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec7e081a76417c756dd9b526ff60249 SHA-1: 38cd383aeaf9d40f63fbf79f00dba9dbfb8f491b SHA-256: 7a8b4f7af4ac57edca424fb2a3652dbdc93f37936752e67adb5b900f658cc4ac
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on Shopify. One of the embedded links, https://ttraff.cc/pify?keyword=human+development+index+report+by+undp, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=human+development+index+report+by+undp
    • http://files.clubomegatree.com/uploads/1/3/0/7/130776481/bulurolutaf-nusebegozuvakik.pdf
    • http://rorarufu.rosariomedicalfoundation.com/uploads/1/3/0/8/130814017/5467806.pdf
    • http://files.bodhibeauty.org/uploads/1/3/2/6/132682976/2783288.pdf
    • http://files.philippecorriveau.com/uploads/1/3/0/7/130740625/2ba4a52d67.pdf
    • http://files.akomaarts.org/uploads/1/3/0/9/130969659/9eeecc107413e78.pdf
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/difference_between_budgetary_control_and_standard_costing.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/bekapipukalinogolilare.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/62313046438.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/76480395380.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/noxumotufukanutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/o_alienista_hq.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/behavior_modification_therapy_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/sezuxobod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/vaweriwomuxup.pdf
    • https://cdn.shopify.com/s/files/1/0428/8551/3379/files/63638565297.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/formal_black_tie_affair_meaning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8e.bin
1c264758392c91ce0921a214d033357a8a91acb5759489b0186d7e9c76cd2406
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 5260 bytes
font_01_sfnt_off00007156.bin
ba095336e385f13c813d7cbcc35bafdedeb3adce0669fc63c82adcb3d5467fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7156 9668 bytes